45Mn_2钻杆接头热处理工艺研究          下载免费PDF全文

刘可忠 《探矿工程》1996,(6):11-13

探讨了４５Ｍｎ２钻杆接头的各种热处理工艺降综合机械性能，应用断裂力学优选最佳热处理工艺，并已投入生产。  相似文献   

Karst Hazard Assessment of Eastern Saudi Arabia   总被引：1，自引：0，他引：1  

Amin  Ammar A.  Bankher  Khalid A. 《Natural Hazards》1997,15(1):21-30

Karst phenomena exist in areas in the eastern part of Saudi Arabia, forming solution features such as sinkholes, collapsed dolines and solution caverns, as a result of the chemical leaching of the carbonate and evaporite formations by percolating water. The instability of these karst phenomena could produce land subsidence problems. This paper reviews the geology of documented karstic rock units in Saudi Arabia and proposes a simple engineering classification of the solution features characteristic of limestone. Two case histories in the Dhahran area, eastern Saudi Arabia, will be used as examples for the application of a modified engineering classification.  相似文献   

盐田港3000吨级钢板码头原体观测试验研究     

徐亘  祝小丰 《华东地质学院学报》1997,(3)

本文介绍了对钢板桩码头岸壁进行的原体观测试验，通过观测钢板桩的挠度、作用在钢板桩上的土压力以及拉杆轴向拉力，可以了解板桩岸壁在回填土的作用下，其结构各主要部分的受力及变形情况，为今后同类型结构的合理分析和设计以及港口工程技术规范有关条文的编制，提供了实测资料。  相似文献   

巨型钢结构抗震研究综述   总被引：1，自引：0，他引：1  

刘洁平  李小东  张令心 《世界地震工程》2004,20(4):42-46

介绍了巨型结构及其特点，着重总结、论述了巨型钢结构在分析方法和抗震研究方面的发展现状，指出了这种钢结构形式在抗震研究中存在的主要问题及今后进一步的研究方向。  相似文献   

圆形截面灌注桩正截面均匀配筋计算可视化     

杨超  罗运军  张英才 《岩土工程技术》2004,18(6):299-302

在圆形截面均匀配筋偏心受压混凝土构件的正截面承载力基本计算公式的基础之上 ,结合基坑工程中圆截面灌注桩的受力特点 ,推导了灌注桩均匀配筋计算的有关公式 ,并以此为基础 ,利用可视化编程软件Delphi 6 .0编写了相应的配筋计算程序。通过实际例证 ,表明该程序计算快捷且结果准确。  相似文献   

长螺旋钻机成孔压灌砼桩后插钢筋笼施工工艺及配套装置的应用     

杨永霞  高谦 《岩土工程技术》2004,18(6):279-281

结合某一工程实例 ,探讨钻孔灌注桩先成桩后插钢筋笼法的施工工艺以及配套装置的工作原理、性能特点、适用范围和施工方法  相似文献   

立井变形监测与治理   总被引：4，自引：0，他引：4  

孟凡森郑庆学  杨中东 《中国煤田地质》2004,16(Z1):59-60

针 对 我国 部 分 统 配煤 矿 立 井 变形 情 况 ,介 绍 了 立井 破 坏 和 变形 两 种 类 型的 原 因 、预 计 方 法 、监 测 方法 及 治 理方 案,对于 立 井的 变形 监 测与 治理 工 作具 有一 定 的借 鉴意 义 。  相似文献   

The effect of an interface boundary layer on the resonance properties of a buried structure     

Y. S. Karinski  V. V. Shershnev  D. Z. Yankelevsky 《地震工程与结构动力学》2004,33(2):227-247

This paper presents a model for the analysis of the diffraction of plane waves at a cavity in an infinite homogeneous linear elastic medium supported by a segmented lining. An elastic boundary layer is introduced between the cavity lining and the infinite medium. The boundary layer is simulated by ‘elastic boundary conditions’ in which the stress is proportional to the relative displacement of the lining and of the surrounding medium boundary. A closed‐form analytical solution of the problem was obtained using the Fourier–Bessel series, the convergence of which was proven. It was shown that the number of series terms required to obtain a desired level of accuracy can be determined in advance. Using amplitude–frequency response analysis it was shown that the boundary layer produces additional ‘pseudo‐resonance’ frequencies that depend on the layer properties. These frequencies are almost identical to the eigenvalues obtained from the simple analysis of a segmented elastically supported lining. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

Seismic performance evaluation of steel arch bridges against major earthquakes. Part 1: dynamic analysis approach     

Tsutomu Usami  Zhihao Lu  Hanbin Ge  Takeshi Kono 《地震工程与结构动力学》2004,33(14):1337-1354

In this study the inelastic behavior of steel arch bridges subjected to strong ground motions from major earthquakes is investigated by dynamic analyses of a typical steel arch bridge using a three‐dimensional (3D) analytical model, since checking seismic performance against severe earthquakes is not usually performed when designing such kinds of bridge. The bridge considered is an upper‐deck steel arch bridge having a reinforced concrete (RC) deck, steel I‐section girders and steel arch ribs. The input ground motions are accelerograms which are modified ground motions based on the records from the 1995 Hyogoken‐Nanbu earthquake. Both the longitudinal and transverse dynamic characteristics of the bridge are studied by investigation of time‐history responses of the main parameters. It is found that seismic responses are small when subjected to the longitudinal excitation, but significantly large under the transverse ground motion due to plasticization formed in some segments such as arch rib ends and side pier bases where axial force levels are very high. Finally, a seismic performance evaluation method based on the response strain index is proposed for such steel bridge structures. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

SH波对无限介质土中衬砌结构的动应力集中     

周香莲  周光明 《岩土力学》2004,25(Z2):366-368

运用复变函数法和保角映射法对无限介质土中的衬砌结构进行分析.通过引入两个势函数将弹性介质的控制方程解耦成两个Helmholtz方程.利用所得势函数的通解,得到无限土介质和衬砌结构的位移和应力的表达式,利用无限介质与衬砌结构之间的连续性条件和衬砌结构内边界上的边界条件,可确定波函数展开式中的末知系数,并给出动应力集中系数的数值结果.  相似文献